I got a really cheap one and it worked fine. It's a digital format, so reasonably good connectors get just as good a signal as high end ones. Others have noted (as did I) that it can be a little tricky to plug it in to the tablet. Don't force it, but make sure you are getting it in all the way. BTW, not sure if it is because of my particular TV or not, but the sound did not seem to be working until I changed the volume even though it was already on at a reasonable volume.
I bought an HDMI adapter so i can put it into the a2109. I was at a friend and the first time it worked well but after we sticked it back into the a2109 it didnt work anymore :'( . I'm using MCL jb rom with the kernel from vampirefo. and the unlimited boost scripts.